Screwdriver with storage for extra bits

Design for a screwdriver/ bit holder with some cool features:Knurled extra grippy exteriorSpace for ¼ hex bits: either 3x 25mm bits or 1x 50mm and 1x 25mm)Cap can be used as stubby driver2 cap designsSpace for optional 5mm diameter magnets at the bottom of the hex hole. Dimensions:Length: 113mm (domed cap), 100mm (flat cap)Diameter: 18mm Inspired by Starrett Automatic centre punch